Guide apparatus for use in folder

Abstract

A guide apparatus is composed of a guide plate which is disposed in such a manner as to be able to move between an active position located within the sheet transfer space and a retreat position where the guide plate does not interfere with the sheet transferring from the collect cylinder to the jaw cylinder; a position-changeover drive unit for moving the guide plate between the active position and the retreat position; a printing-speed detection unit for detecting the driving speed of a rotary press and outputting a driving speed signal during printing; and a control unit for outputting, upon reception of the driving speed signal from the printing-speed detection unit, a position changeover signal to the position-changeover drive unit in order to move the guide plate accordingly.

What is claimed is:  
     
       1. A guide apparatus for use in a folder in which a cutting cylinder and a jaw cylinder are disposed around a collect cylinder such that a gap is formed between the cutting cylinder and the collect cylinder and between the jaw cylinder face and the collect cylinder; pairs each consisting of a cutting bar extending axially and a pin are circumferentially arranged on an outer circumferential surface of the collect cylinder at circumferential intervals each corresponding to a length of a sheet such that the pins are projectable from an outer circumferential surface of the collect cylinder at locations adjacent to and behind the corresponding cutting bars in the rotational direction of the collect cylinder; tucking blades extending axially are each disposed at a substantially circumferentially central position between adjacent two of the cutting bars to be projectable from the outer circumferential surface of the collect cylinder; a knife extending axially projects from the outer circumferential surface of the cutting cylinder; jaw mechanisms are circumferentially arranged on the outer circumferential surface of the jaw cylinder at circumferential intervals each corresponding to the length of a sheet; a paper guide is disposed over an appropriate range covering a portion of the outer circumferential surface of the collect cylinder and a portion of the outer circumferential surface of the jaw cylinder, which portions are located downstream of a narrowest gap between the collect cylinder and the jaw cylinder with respect to rotational directions of the collect cylinder and the jaw cylinder, such that an inner surface of the paper guide faces the outer circumferential surfaces of the collect cylinder and the jaw cylinder while an appropriate gap is maintained therebetween and such that the inner surface of the paper guide, together with the outer circumferential surfaces of the collect cylinder and the jaw cylinder, defines a sheet transfer space having a substantially triangular cross section; and the knife and the cutting bar cooperatively cut off a sheet of predetermined length from a web, while the jaw mechanism and the tucking blade cooperatively fold the sheet; the guide apparatus comprising: 
       a guide unit disposed in such a manner as to be able to move between an active position located within the sheet transfer space and apart from the outer circumferential surface of the collect cylinder to such an extent as not to allow the sheet to slack, and a retreat position where the guide unit does not interfere with the sheet transferring from the collect cylinder to the jaw cylinder;  
       a position-changeover drive unit for moving the guide unit between the active position and the retreat position;  
       a printing-speed detection unit for detecting driving speed of a rotary press and outputting a driving speed signal during printing; and  
       a control unit for outputting, upon reception of the driving speed signal from the printing-speed detection unit, a position changeover signal to the position-changeover drive unit in order to move the guide unit accordingly.  
     
     
       2. A guide apparatus for use in a folder according to  claim 1 , wherein the guide unit comprises two elongated guide plates which extend in the transferring direction of the sheet within the sheet transfer space and which are supported on the paper guide to be movable between the active position and the retreat position. 
     
     
       3. A guide apparatus for use in a folder according to  claim 2 , wherein the position-changeover drive unit comprises a hydraulic cylinder operatively connected to the elongated guide plates and adapted to move the guide plates between the active position and the retreat position.